9JNR | pdb_00009jnr

McyI-MCLR co-crystal

• PDB DOI: https://doi.org/10.2210/pdb9JNR/pdb

• Classification: STRUCTURAL PROTEIN
• Organism(s): Microcystis aeruginosa PCC 7806
• Expression System: Escherichia coli
• Mutation(s): No 


• Deposited: 2024-09-23 Released: 2025-10-01 
• Deposition Author(s): Wang, Q., Xue, C.
• Funding Organization(s): National Natural Science Foundation of China (NSFC)

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Experimental Data Snapshot

• Method: X-RAY DIFFRACTION
• Resolution: 2.44 Å
• R-Value Free: 
  0.226 (Depositor), 0.225 (DCC) 
• R-Value Work: 
  0.185 (Depositor), 0.186 (DCC) 
• R-Value Observed: 
  0.187 (Depositor) 

Starting Model: experimental

Literature

McyI: A Moonlighting Protein Central to Microcystin-LR Biosynthesis and the Fine-Tuned Self-Detoxification Mechanism

Xue, C., Wang, Q.

To be published.

Biological Assembly 1  

Global Symmetry: Cyclic - C2  (Explore in 3D)
Global Stoichiometry: Homo 2-mer - A2 

Biological assembly 1 assigned by authors and generated by PISA (software)

Macromolecule Content 

• Total Structure Weight: 73.73 kDa 
• Atom Count: 5,428 
• Modeled Residue Count: 658 
• Deposited Residue Count: 660 
• Unique protein chains: 1

Macromolecules

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details	Image
McyI	A, B	330	Microcystis aeruginosa PCC 7806	Mutation(s): 0  Gene Names: mcyI, IPF_368
UniProt
Find proteins for Q9RNB7 (Microcystis aeruginosa (strain PCC 7806)) Explore Q9RNB7  Go to UniProtKB:  Q9RNB7

Small Molecules

Ligands 2 Unique
ID	Chains	Name / Formula / InChI Key	2D Diagram
NAD (Subject of Investigation/LOI)	C [auth A], D [auth B]	NICOTINAMIDE-ADENINE-DINUCLEOTIDE C21 H27 N7 O14 P2 BAWFJGJZGIEFAR-NNYOXOHSSA-N
PO4 (Subject of Investigation/LOI)	E [auth B]	PHOSPHATE ION O4 P NBIIXXVUZAFLBC-UHFFFAOYSA-K

Experimental Data & Validation

Experimental Data

• Method: X-RAY DIFFRACTION
• Resolution: 2.44 Å
• R-Value Free:  0.226 (Depositor), 0.225 (DCC) 
• R-Value Work:  0.185 (Depositor), 0.186 (DCC) 
• R-Value Observed: 0.187 (Depositor) 

Space Group: P 2₁ 2₁ 2₁

Unit Cell:

Length ( Å )	Angle ( ˚ )
a = 52.122	α = 90
b = 101.576	β = 90
c = 131.201	γ = 90

Software Package:

Software Name	Purpose
PHENIX	refinement
HKL-3000	data scaling
HKL-3000	data reduction
PHENIX	phasing
PDB_EXTRACT	data extraction

Structure Validation

Entry History & Funding Information

Deposition Data

• Released Date: 2025-10-01 
Deposition Author(s): Wang, Q., Xue, C.

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Funding Organization	Location	Grant Number
National Natural Science Foundation of China (NSFC)	China	32170138

Revision History  

• Version 1.0: 2025-10-01
  Type: Initial release